upgrade 6.* crashed my computer OS 10.9.5

3/8 release was offered for my version LR6.* running mac OS 10.9.5, i noticed this week that the software was acting unusual in a bad way.. thought this upgrade would help.. now error code: U44M1P7 appears after install fails and i'm left with crippled software. i have bought ever relase of LR since inception, this really pisses me off